US7049799B2 - Voltage regulator and electronic device - Google Patents
Voltage regulator and electronic device Download PDFInfo
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- US7049799B2 US7049799B2 US10/712,145 US71214503A US7049799B2 US 7049799 B2 US7049799 B2 US 7049799B2 US 71214503 A US71214503 A US 71214503A US 7049799 B2 US7049799 B2 US 7049799B2
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/575—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices characterised by the feedback circuit
Definitions
- the present invention relates to a voltage regulator (hereinafter referred to as V/R) capable of improving an overshoot characteristic of the V/R.
- V/R voltage regulator
- the present invention also relates to an electronic device equipped with the voltage regulator.
- a conventional V/R includes: a V/R control circuit composed of an error amplifier 13 that amplifies a differential voltage between a reference voltage Vref 1 of a reference voltage circuit 10 and a voltage at a connection point of bleeder resistors 11 and 12 that divide a voltage (hereinafter referred to as an output voltage) Vout at an output terminal 6 of the V/R; and an output MOS transistor 14 .
- the V/R operates according to a voltage (hereinafter referred to as VDD 1 ) supplied from a voltage source 15 .
- Verr Assuming that an output voltage of the error amplifier 13 is given by Verr and a voltage at the connection point of the bleeder resistors 11 and 12 is given by Va, if Vref 1 >Va is established, Verr becomes lower. On the other hand, if Vref 1 ⁇ Va is established, Verr becomes higher.
- the output MOS transistor 14 is a P-ch MOS transistor in this case, a voltage between a gate and a source thereof becomes larger and an ON resistance becomes smaller, so that the V/R functions to raise the output voltage Vout.
- the V/R functions to increase the ON resistance of the output transistor 14 and to reduce the output voltage, thereby keeping the output voltage Vout at a fixed value (for example, see JP 04-195613 A (pages 1 to 3 and FIG. 2 )).
- phase compensating capacitor needs to be suitably added to the V/R if necessary.
- the error amplifier 13 of the V/R includes: a current mirror circuit composed of a P-ch MOS transistor 16 and a P-ch MOS transistor 17 ; an input differential pair composed of an N-ch MOS transistor 18 and an N-ch MOS transistor 19 ; and a constant current circuit 20 into which a constant current 11 flows.
- an operating current of the error amplifier 13 is determined by a constant current circuit 20 . Therefore, there arises the following problem. If a current flowing into the constant current circuit 20 is reduced in order to realize a V/R having low current consumption, when the power source is started, that is, when VDD 1 is provided as a pulse signal, or when a load connected with the output terminal 6 of the V/R is suddenly reduced, the output voltage Vout largely tends to exhibit an overshoot characteristic. In other words, a power source start characteristic is sacrificed. On the other hand, if a current flowing into the constant current circuit 20 is increased in order to realize a V/R having an improved overshoot characteristic, the low current consumption characteristic is sacrificed.
- the low current consumption characteristic is required to lengthen a life of the battery.
- the overshoot characteristic of the output voltage Vout of the V/R it is necessary to avoid a state in which the output voltage becomes equal to or larger than a withstanding voltage of an external element connected with the output terminal of the V/R.
- the overshoot characteristic of the V/R is improved, for the purpose of achieving a wide band of the error amplifier 13 , it is basically unavoidable to increase the operating current of the error amplifier 13 .
- the battery is used as the power source, it is essential to obtain the low current consumption characteristic. Accordingly, in the current state, it is not acceptable to increase the current consumption of the V/R itself.
- An object of the present invention is to control, only in the case where a voltage to which an output voltage Vout is to be controlled is higher than a desirable value, an operating current of an error amplifier composing a V/R to a temporarily large value to achieve a wide band of the error amplifier, thereby improving an overshoot characteristic, and to control, in cases other than the abovementioned case, the operating current of the error amplifier composing the V/R to a small value to achieve a reduction in current consumption.
- a voltage regulator including:
- a current adding circuit that controls an operating current of the error amplifier in accordance with the output voltage of the output terminal and the voltage of the voltage source.
- the current adding circuit increases the operating current of the error amplifier when the output voltage of the output terminal is higher than a predetermined value.
- an electronic device including the above-mentioned voltage regulator.
- FIG. 1 is an explanatory circuit diagram of a voltage regulator showing Embodiment 1 of the present invention
- FIG. 2 is an explanatory circuit diagram of the voltage regulator showing Embodiment 1 of the present invention.
- FIG. 3 is an explanatory circuit diagram of a conventional voltage regulator
- FIG. 4 is an explanatory circuit diagram of the conventional voltage regulator.
- FIG. 1 is a circuit diagram of a V/R showing Embodiment 1 of the present invention.
- FIG. 1 is distinguished from FIG. 4 in that a current adding circuit 21 is provided.
- the current adding circuit 21 acts to increase the operating current of an error amplifier in a state in which it is detected that a voltage to which an output voltage Vout is to be controlled is higher than a predetermined or desirable value.
- the current adding circuit 21 includes: a bleeder resistor 28 and a bleeder resistor 29 that divide the output voltage Vout; an N-ch MOS transistor 27 that is ON/Off-controlled by a voltage Vb at a connection point between the bleeder resistor 28 and the bleeder resistor 29 ; a resistor 26 for pulling up a voltage in a drain of the N-ch MOS transistor 27 ; an inverter 23 to which a voltage Vc at a connection point between the drain of the N-ch MOS transistor 27 and an end of the resistor 26 is inputted; an N-ch MOS transistor 22 that is ON/Off-controlled by an output voltage Vd of the inverter 23 ; a reference voltage circuit 25 that outputs a voltage Vref 2 ; and an N-ch MOS transistor 24 in which the voltage Vref 2 is applied to a gate thereof.
- the current adding circuit 21 corresponds to an area surrounded by a dotted line.
- a constant current circuit 20 corresponds to the N-ch MOS transistor in which the voltage Vref 2 is applied to the gate thereof.
- the potential at the connection point between the bleeder resistor 28 and the bleeder resistor 29 that divide the output voltage Vout is Vb. Therefore, when the output voltage Vout is increased and Vb reaches a voltage for turning ON the N-ch MOS transistor 27 , the voltage Vc becomes lower (hereinafter referred to as “L”) by voltage drop produced in the resistor 26 . On the other hand, when the output voltage Vout is reduced and Vb reaches a voltage for turning OFF the N-ch MOS transistor 27 , the voltage Vc becomes higher (hereinafter referred to as “H”).
- the output voltage Vd of the inverter 23 to which such Vc is inputted becomes “L”, thereby turning OFF the N-ch MOS transistor 22 . Accordingly, the drain current does not flow into the N-ch MOS transistor 24 in which the voltage Vref 2 is applied to the gate thereof, so that the operating current of the error amplifier becomes only a current I 1 from the constant current circuit 20 .
- the output voltage Vout by which Vb causes the N-ch MOS transistor 27 to be turned ON or OFF can be set by suitably providing resistance values of the bleeder resistor 28 and the bleeder resistor 29 . Accordingly, when it is detected that a voltage to which the output voltage Vout is to be controlled is higher than a desirable value, the operating current of the error amplifier can be increased.
- the operating current of the error amplifier composing the V/R is controlled to a temporarily large value to achieve a wide band of the error amplifier, thereby improving an overshoot characteristic.
- the operating current of the error amplifier composing the V/R is controlled to a small value to achieve a reduction in current consumption.
- the operating current of the error amplifier 13 is determined by the constant current circuit 20 . Accordingly, there arises the following problem.
- the output voltage Vout largely tends to exhibit the overshoot characteristic. In other words, a power source start characteristic is sacrificed.
- the current flowing into the constant current circuit 20 is increased in order to realize the V/R having the improved overshoot characteristic, the low current consumption characteristic is sacrificed.
- Vref 2 is applied to the gate of the N-ch MOS transistor composing the constant current circuit 20 and the gate of the N-ch MOS transistor 24 .
- Vref 3 is newly provided, Vref 2 and Vref 3 are separately applied, and Vref 2 and Vref 3 are set to arbitrary values, an effect can be obtained that the current increased by the current adding circuit 21 is variable and can be arbitrarily set.
- a lower limit value of the output voltage Vout for controlling the operating current of the error amplifier composing the V/R to a temporarily large value is variable and can be arbitrarily set.
- the current adding circuit 21 includes the structure as shown in FIG. 2 .
- the current adding circuit 21 includes another structure capable of having the same function as in FIG. 2 , the same effect can be obtained.
- the circuit that increases the operating current of the error amplifier when it is detected that the voltage to which the output voltage is to be controlled is higher than a desirable value is provided. Accordingly, only in the case where the voltage for controlling the output voltage is higher than the desirable value, the operating current of the error amplifier composing the V/R can be controlled to a temporarily large value to achieve a wide band of the error amplifier, thereby improving an overshoot characteristic. In cases other than the above-mentioned case, the operating current of the error amplifier composing the V/R can be controlled to a small value to achieve a reduction in current consumption.
- the current increased by the circuit that increases the operating current of the error amplifier is variable and can be arbitrarily set.
- the voltage detected by the circuit that increases the operating current of the error amplifier is variable and can be arbitrarily set.
- an electronic device includes the above-mentioned voltage regulator.
- a reduction in power consumption is possible.
Abstract
A voltage regulator has a reference voltage circuit, a voltage source, an output terminal from which an output voltage is outputted in accordance with a voltage of the voltage source, and a voltage dividing circuit for dividing the output voltage of the output terminal. An error amplified outputs a signal in accordance with an output of the voltage dividing circuit and an output of the reference voltage circuit. An output transistor is connected between the voltage source and the voltage dividing circuit and is ON/OFF-controlled in accordance with the signal outputted from the error amplifier. A current adding circuit controls an operating current of the error amplifier in accordance with the output voltage of the output terminal and the voltage of the voltage source by increasing the operating current of the error amplifier when the output voltage of the output terminal is higher than a predetermined value.
Description
1. Field of the Invention
The present invention relates to a voltage regulator (hereinafter referred to as V/R) capable of improving an overshoot characteristic of the V/R. The present invention also relates to an electronic device equipped with the voltage regulator.
2. Description of the Related Art
As shown in a circuit diagram of FIG. 3 , a conventional V/R includes: a V/R control circuit composed of an error amplifier 13 that amplifies a differential voltage between a reference voltage Vref1 of a reference voltage circuit 10 and a voltage at a connection point of bleeder resistors 11 and 12 that divide a voltage (hereinafter referred to as an output voltage) Vout at an output terminal 6 of the V/R; and an output MOS transistor 14. The V/R operates according to a voltage (hereinafter referred to as VDD1) supplied from a voltage source 15. Assuming that an output voltage of the error amplifier 13 is given by Verr and a voltage at the connection point of the bleeder resistors 11 and 12 is given by Va, if Vref1>Va is established, Verr becomes lower. On the other hand, if Vref1<Va is established, Verr becomes higher.
If Verr becomes lower, because the output MOS transistor 14 is a P-ch MOS transistor in this case, a voltage between a gate and a source thereof becomes larger and an ON resistance becomes smaller, so that the V/R functions to raise the output voltage Vout. On the other hand, if Verr becomes higher, the V/R functions to increase the ON resistance of the output transistor 14 and to reduce the output voltage, thereby keeping the output voltage Vout at a fixed value (for example, see JP 04-195613 A (pages 1 to 3 and FIG. 2 )).
Although not shown here, it is generally known that a phase compensating capacitor needs to be suitably added to the V/R if necessary.
Also, it is generally known that, for example, as shown in FIG. 4 , the error amplifier 13 of the V/R includes: a current mirror circuit composed of a P-ch MOS transistor 16 and a P-ch MOS transistor 17; an input differential pair composed of an N-ch MOS transistor 18 and an N-ch MOS transistor 19; and a constant current circuit 20 into which a constant current 11 flows.
However, in the conventional V/R, an operating current of the error amplifier 13 is determined by a constant current circuit 20. Therefore, there arises the following problem. If a current flowing into the constant current circuit 20 is reduced in order to realize a V/R having low current consumption, when the power source is started, that is, when VDD1 is provided as a pulse signal, or when a load connected with the output terminal 6 of the V/R is suddenly reduced, the output voltage Vout largely tends to exhibit an overshoot characteristic. In other words, a power source start characteristic is sacrificed. On the other hand, if a current flowing into the constant current circuit 20 is increased in order to realize a V/R having an improved overshoot characteristic, the low current consumption characteristic is sacrificed.
When a battery is used as the power source, the low current consumption characteristic is required to lengthen a life of the battery. On the other hand, with regard to the overshoot characteristic of the output voltage Vout of the V/R, it is necessary to avoid a state in which the output voltage becomes equal to or larger than a withstanding voltage of an external element connected with the output terminal of the V/R.
When the overshoot characteristic of the V/R is improved, for the purpose of achieving a wide band of the error amplifier 13, it is basically unavoidable to increase the operating current of the error amplifier 13. However, when the battery is used as the power source, it is essential to obtain the low current consumption characteristic. Accordingly, in the current state, it is not acceptable to increase the current consumption of the V/R itself.
Therefore, the present invention has been made to solve the foregoing problems in the conventional art. An object of the present invention is to control, only in the case where a voltage to which an output voltage Vout is to be controlled is higher than a desirable value, an operating current of an error amplifier composing a V/R to a temporarily large value to achieve a wide band of the error amplifier, thereby improving an overshoot characteristic, and to control, in cases other than the abovementioned case, the operating current of the error amplifier composing the V/R to a small value to achieve a reduction in current consumption.
In order to achieve the above object, according to the present invention, there is provided a voltage regulator including:
a reference voltage circuit;
a voltage source;
an output terminal from which an output voltage is outputted in accordance with a voltage of the voltage source,
a voltage dividing circuit that divides the output voltage;
an error amplifier that outputs a signal in accordance with an output of the voltage dividing circuit and an output of the reference voltage circuit;
an output transistor that is connected between the voltage source and the voltage dividing circuit and ON/OFF-controlled in accordance with the signal outputted from the error amplifier; and
a current adding circuit that controls an operating current of the error amplifier in accordance with the output voltage of the output terminal and the voltage of the voltage source.
Further, the current adding circuit increases the operating current of the error amplifier when the output voltage of the output terminal is higher than a predetermined value.
Further, according to the present invention, there is provided an electronic device including the above-mentioned voltage regulator.
In the accompanying drawings:
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a circuit diagram of a V/R showing Embodiment 1 of the present invention. FIG. 1 is distinguished from FIG. 4 in that a current adding circuit 21 is provided. The current adding circuit 21 acts to increase the operating current of an error amplifier in a state in which it is detected that a voltage to which an output voltage Vout is to be controlled is higher than a predetermined or desirable value.
For example, as shown in FIG. 2 , the current adding circuit 21 includes: a bleeder resistor 28 and a bleeder resistor 29 that divide the output voltage Vout; an N-ch MOS transistor 27 that is ON/Off-controlled by a voltage Vb at a connection point between the bleeder resistor 28 and the bleeder resistor 29; a resistor 26 for pulling up a voltage in a drain of the N-ch MOS transistor 27; an inverter 23 to which a voltage Vc at a connection point between the drain of the N-ch MOS transistor 27 and an end of the resistor 26 is inputted; an N-ch MOS transistor 22 that is ON/Off-controlled by an output voltage Vd of the inverter 23; a reference voltage circuit 25 that outputs a voltage Vref2; and an N-ch MOS transistor 24 in which the voltage Vref2 is applied to a gate thereof. In FIG. 2 , the current adding circuit 21 corresponds to an area surrounded by a dotted line. Note that, in FIG. 2 , a constant current circuit 20 corresponds to the N-ch MOS transistor in which the voltage Vref2 is applied to the gate thereof.
As described above, the potential at the connection point between the bleeder resistor 28 and the bleeder resistor 29 that divide the output voltage Vout is Vb. Therefore, when the output voltage Vout is increased and Vb reaches a voltage for turning ON the N-ch MOS transistor 27, the voltage Vc becomes lower (hereinafter referred to as “L”) by voltage drop produced in the resistor 26. On the other hand, when the output voltage Vout is reduced and Vb reaches a voltage for turning OFF the N-ch MOS transistor 27, the voltage Vc becomes higher (hereinafter referred to as “H”).
When Vc is “L”, the output voltage Vd of the inverter 23 to which such Vc is inputted becomes “H”, thereby turning ON the N-ch MOS transistor 22. Accordingly, a drain current I2 flows into the N-ch MOS transistor 24 in which the voltage Vref2 is applied to the gate thereof, so that the operating current of the error amplifier is increased by the drain current amount.
On the other hand, when Vc is “H”, the output voltage Vd of the inverter 23 to which such Vc is inputted becomes “L”, thereby turning OFF the N-ch MOS transistor 22. Accordingly, the drain current does not flow into the N-ch MOS transistor 24 in which the voltage Vref2 is applied to the gate thereof, so that the operating current of the error amplifier becomes only a current I1 from the constant current circuit 20. The output voltage Vout by which Vb causes the N-ch MOS transistor 27 to be turned ON or OFF can be set by suitably providing resistance values of the bleeder resistor 28 and the bleeder resistor 29. Accordingly, when it is detected that a voltage to which the output voltage Vout is to be controlled is higher than a desirable value, the operating current of the error amplifier can be increased.
Therefore, only in the case where the voltage to which the output voltage Vout is to be controlled is higher than the desirable value, the operating current of the error amplifier composing the V/R is controlled to a temporarily large value to achieve a wide band of the error amplifier, thereby improving an overshoot characteristic. In cases other than the above-mentioned case, the operating current of the error amplifier composing the V/R is controlled to a small value to achieve a reduction in current consumption. In the conventional V/R, the operating current of the error amplifier 13 is determined by the constant current circuit 20. Accordingly, there arises the following problem. If the current flowing into the constant current circuit 20 is reduced in order to realize the V/R having the low current consumption, when the power source is started, that is, when VDD1 is provided as a pulse signal, or when a load connected with the output terminal 6 of the V/R is suddenly reduced, the output voltage Vout largely tends to exhibit the overshoot characteristic. In other words, a power source start characteristic is sacrificed. On the other hand, if the current flowing into the constant current circuit 20 is increased in order to realize the V/R having the improved overshoot characteristic, the low current consumption characteristic is sacrificed. Thus, the above-mentioned problem can be solved.
According to the above description, Vref2 is applied to the gate of the N-ch MOS transistor composing the constant current circuit 20 and the gate of the N-ch MOS transistor 24. However, when Vref3 is newly provided, Vref2 and Vref3 are separately applied, and Vref2 and Vref3 are set to arbitrary values, an effect can be obtained that the current increased by the current adding circuit 21 is variable and can be arbitrarily set.
Also, in the above description, when the bleeder resistor 28 and the bleeder resistor 29 are used as variable resistors, a lower limit value of the output voltage Vout for controlling the operating current of the error amplifier composing the V/R to a temporarily large value is variable and can be arbitrarily set.
Also, according to the above description, the current adding circuit 21 includes the structure as shown in FIG. 2 . However, even when the current adding circuit 21 includes another structure capable of having the same function as in FIG. 2 , the same effect can be obtained.
Thus, as described above, according to the voltage regulator of the present invention, the circuit that increases the operating current of the error amplifier when it is detected that the voltage to which the output voltage is to be controlled is higher than a desirable value is provided. Accordingly, only in the case where the voltage for controlling the output voltage is higher than the desirable value, the operating current of the error amplifier composing the V/R can be controlled to a temporarily large value to achieve a wide band of the error amplifier, thereby improving an overshoot characteristic. In cases other than the above-mentioned case, the operating current of the error amplifier composing the V/R can be controlled to a small value to achieve a reduction in current consumption.
Further, depending on a structure of the circuit that increases the operating current of the error amplifier when it is detected that the voltage to which the output voltage is to be controlled is higher than the desirable value, the current increased by the circuit that increases the operating current of the error amplifier is variable and can be arbitrarily set.
Further, depending on a structure of the circuit that increases the operating current of the error amplifier when it is detected that the voltage to which the output voltage is to be controlled is higher than the desirable value, the voltage detected by the circuit that increases the operating current of the error amplifier is variable and can be arbitrarily set.
Furthermore, an electronic device according to the present invention includes the above-mentioned voltage regulator. Thus, a reduction in power consumption is possible.
Claims (9)
1. A voltage regulator comprising:
a reference voltage circuit;
a voltage source;
an output terminal from which an output voltage is outputted in accordance with a voltage of the voltage source;
a voltage dividing circuit for dividing the output voltage of the output terminal;
an error amplifier for outputting a signal in accordance with an output of the voltage dividing circuit and an output of the reference voltage circuit;
an output transistor connected between the voltage source and the voltage dividing circuit and ON/OFF-controlled in accordance with the signal outputted from the error amplifier; and
a current adding circuit for controlling an operating current of the error amplifier in accordance with the output voltage of the output terminal and the voltage of the voltage source by increasing the operating current of the error amplifier when the output voltage of the output terminal is higher than a predetermined value.
2. An electronic device comprising the voltage regulator according to claim 1 .
3. A voltage regulator according to claim 1 ; wherein the current adding circuit comprises a pair of bleeder resistors for dividing the output voltage, a first N-MOS transistor ON/OFFcontrolled by as voltage at a connection point between the bleeder resistors, a resistor for raising a voltage in a drain of the first NMOS transistor, an inverter to which a voltage at a connection point between the drain of the first N-MOS transistor and an end of the resistor is inputted, a second N-NOS transistor ON/OFF-controlled by an output voltage of the inverter, and a third N-MOS transistor having a gate to which a reference voltage is applied.
4. A voltage regulator according to claim 1 ; wherein the current adding circuit controls the operating current of the error amplifier to a temporary large value only when the output voltage of the output terminal is higher than the predetermined value.
5. A voltage regulator comprising:
a reference voltage circuit;
a voltage source;
an output terminal from which an output voltage is outputted in accordance with a voltage of the voltage source;
a voltage dividing circuit for dividing the output voltage of the output terminal;
an error amplifier for outputting a signal in accordance with an output of the voltage dividing circuit and an output of the reference voltage circuit; and
control means for controlling an operating current of the error amplifier to a temporary large value only in a case when the output voltage of the output terminal is higher than a predetermined value.
6. A voltage regulator according to claim 5 ; further comprising an output transistor connected between the voltage source and the voltage dividing circuit and ON/OFF-controlled in accordance with the signal outputted from the error amplifier.
7. A voltage regulator according to claim 5 ; wherein the control means comprises a current adding circuit having a pair of bleeder resistors for dividing the output voltage, a first N-MOS transistor ON/OFF-controlled by as voltage at a connection point between the bleeder resistors, a resistor for raising a voltage in a drain of the first N-MOS transistor, an inverter to which a voltage at a connection point between the drain of the first N-MOS transistor and an end of the resistor is inputted, a second NMOS transistor ON/OFF-controlled by an output voltage of the inverter, and a third N-MOS transistor having a gate to which a reference voltage is applied.
8. A voltage regulator according to claim 5 ; wherein the control means includes means for controlling, in cases other than when the output voltage of the output terminal is higher than the predetermined value, the operating current of the error amplifier to a small value to achieve a reduction in power consumption of the voltage regulator.
9. An electronic device comprising the voltage regulator according to claim 5 .
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002330846A JP4005481B2 (en) | 2002-11-14 | 2002-11-14 | Voltage regulator and electronic equipment |
| JP2002-330846 | 2002-11-14 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| US20040113595A1 US20040113595A1 (en) | 2004-06-17 |
| US7049799B2 true US7049799B2 (en) | 2006-05-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US10/712,145 Active 2024-05-30 US7049799B2 (en) | 2002-11-14 | 2003-11-13 | Voltage regulator and electronic device |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US7049799B2 (en) |
| JP (1) | JP4005481B2 (en) |
Cited By (4)
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| US20060012346A1 (en) * | 2004-07-19 | 2006-01-19 | Jian-Rong Huang | Overshoot suppression circuit for a voltage regulation module |
| US7272464B1 (en) | 2006-06-22 | 2007-09-18 | Jurewicz Jr John J | Apparatus and method for mobile computer-aided design |
| US20090033311A1 (en) * | 2007-08-03 | 2009-02-05 | International Business Machines Corporation | Current Source with Power Supply Voltage Variation Compensation |
| US20090153122A1 (en) * | 2007-12-13 | 2009-06-18 | Kawagishi Norihiro | Dropper-type regulator |
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| JP4354360B2 (en) * | 2004-07-26 | 2009-10-28 | Ｏｋｉセミコンダクタ株式会社 | Buck power supply |
| JP4550506B2 (en) * | 2004-07-26 | 2010-09-22 | ルネサスエレクトロニクス株式会社 | DC stabilized power supply circuit |
| JP2006331059A (en) * | 2005-05-26 | 2006-12-07 | Ricoh Co Ltd | Voltage regulator |
| JP4848689B2 (en) * | 2005-07-11 | 2011-12-28 | セイコーエプソン株式会社 | Semiconductor integrated circuit |
| JP2007128292A (en) * | 2005-11-04 | 2007-05-24 | Ricoh Co Ltd | Voltage regulator |
| US7615976B2 (en) * | 2006-04-19 | 2009-11-10 | System General Corp. | Switching circuit of power converter having voltage-clipping device to improve efficiency |
| KR100780209B1 (en) * | 2006-05-26 | 2007-11-27 | 삼성전기주식회사 | Voltage regulating apparatus |
| JP5361614B2 (en) * | 2009-08-28 | 2013-12-04 | ルネサスエレクトロニクス株式会社 | Buck circuit |
| JP6024408B2 (en) * | 2012-11-15 | 2016-11-16 | ミツミ電機株式会社 | Power circuit |
| US9268349B2 (en) | 2013-12-06 | 2016-02-23 | Shenzhen China Star Optoelectronics Technology Co., Ltd. | Circuit and method for optimizing input voltage range of IC chip |
| CN103677053B (en) * | 2013-12-06 | 2015-12-09 | 深圳市华星光电技术有限公司 | A kind of IC chip input voltage scope optimized circuit and optimization method |
| JP6457887B2 (en) * | 2015-05-21 | 2019-01-23 | エイブリック株式会社 | Voltage regulator |
| JP7065660B2 (en) * | 2018-03-22 | 2022-05-12 | エイブリック株式会社 | Voltage regulator |
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| US4731574A (en) * | 1983-11-15 | 1988-03-15 | Sgs-Ates Deutschland Halbleiter Bauelemente Gmbh | Series voltage regulator with limited current consumption at low input voltages |
| US5828206A (en) * | 1995-03-17 | 1998-10-27 | Toko Kabushiki Kaisha | Serial control type voltage regulator |
| US5945819A (en) * | 1996-05-31 | 1999-08-31 | Sgs-Thomson Microelectronics S.R.L. | Voltage regulator with fast response |
| US20020093322A1 (en) * | 2000-12-27 | 2002-07-18 | Stmicroelectronics S.A. | Voltage regulating device and process |
| US20040130305A1 (en) * | 2001-04-10 | 2004-07-08 | Hideki Agari | Voltage regulator |
| US6617833B1 (en) * | 2002-04-01 | 2003-09-09 | Texas Instruments Incorporated | Self-initialized soft start for Miller compensated regulators |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060012346A1 (en) * | 2004-07-19 | 2006-01-19 | Jian-Rong Huang | Overshoot suppression circuit for a voltage regulation module |
| US7274177B2 (en) * | 2004-07-19 | 2007-09-25 | Richtek Technology Corp. | Overshoot suppression circuit for a voltage regulation module |
| US7272464B1 (en) | 2006-06-22 | 2007-09-18 | Jurewicz Jr John J | Apparatus and method for mobile computer-aided design |
| US20090033311A1 (en) * | 2007-08-03 | 2009-02-05 | International Business Machines Corporation | Current Source with Power Supply Voltage Variation Compensation |
| US20090153122A1 (en) * | 2007-12-13 | 2009-06-18 | Kawagishi Norihiro | Dropper-type regulator |
| US8120338B2 (en) * | 2007-12-13 | 2012-02-21 | Oki Semiconductor Co., Ltd. | Dropper-type regulator |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2004164411A (en) | 2004-06-10 |
| US20040113595A1 (en) | 2004-06-17 |
| JP4005481B2 (en) | 2007-11-07 |
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